Steam-pump.



H. L. THOMPSON.

STEAM PUMP.

APPLICATION FILED NOV. 25, 1906.

938,724; PatentedNov. 2, 1909.

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UNITED STATES PATEN HERBERT THOMPSON, OF ELGIN, ILLINOIS.

EPIC

STEAM-PUMP.

sears Specification of Letters Patent.

Patented Nov. 2, 1909.

Application filed November 25, 1908. Serial No. 464,401.

- feed pumps adapted particularly for the automatic feeding of flash boilers.

The object of my invention is to provide regulating or throttling means in a feed pump which will be automatically controlled. And a further object of my invention is to provide a yieldable check valve and a resilient holder therefor.

Other objects will appear hereinafter.

With these objects in view my invention consists in a pump suitably located in a water so ply tank and submerged therein, a pump cy inder and a plunger therefor, and automatic means to regulate the movement of said plunger in order to maintaina constant pressure.

My invention further consists in various details of construction and arrangement of parts all as will be hereinafter fully set' forth and particularly pointed out in the claims.

My invention will be more readily understood by reference to the accompanying drawings forming a part of this specification, and in'which 1 Figure 1 is a top elevation of my improved feed pump in its preferred form, Fig. 2 is substantially a vertical section taken on line ca' of Fig. 1, Fig. 3 is a detailed perspective View of the ump check valve, and Figs. 4 and 5 are detailed bottom elevations.

Referring now to the drawings, 1 indicates the water supply, and 2 the pump base integral therewith. A dome 3 preferably of copper is rigidly secured to the base 2 by means of the screws 4. Containedwithin the dome 3 and securely connected thereto is a barrel or cylinder 5 in which the plunger 6 is adapted to reciprocate. To provide clearonce for a needle valve 7 designed to open and close the discharge orifice 8 a circular depression 9 is provided in the base 2. The delivery pipe 10 is connected with the flash boiler, not shown, and 18 secured in the base ater is adapted to flow to the cylinder 5 is ecurelv fixed in the walls of the dome 3 and The suction pipe 11 through which said cylinder, the inner extremity of the pipe 11 constituting the intake cylinder port 12. A rubber diskvalve 1? acts asithe delivery check valve and is held in its seat 13 by means of the spring or holder 14. The

holder 14 comprises radial arms .14! the outer extremities of which are adapted to seat on the base 2 adjacent to the base of the dome 3. Downwardly extendin projections 15 in the cylinder 5 are adapts to pass between the radial arms 14' in the holder ll and to hold the check Valve 13 in position.

The needle valve 7 is adapted to screw into the base 2 and is provided with a rubber washer 16 to render the connection waterproof. It will thus be seen that the discharge orifice 8 may be throttled at will by an operator by simply turning the handle 17. A standard 18 rovided wlth a bracket 19 in tegral with t e base 2 is [provided to receive the adjustin screw 20 an the leaf spring 21. The standar 18 is tapped to receive the said screw 20, and the spring 21 is secured to the bracket 19 by means of the screws 22. The said screw 20 asses through an elongated perforation 22' 1n the spring 21 and is adapted to limit the u ward movement of said spring. The vertically reciprocating pump operating rod 23 is provided with a perforated fork 24 at its lower extremity, a portion of which only is shown in Fig. 2. A pin 25 secured in perforations in the fork 24 is adapted to reciprocate in the slot 26 provided in the plunger 6 and to normally move said plunger in its u ward or suction stroke. The spring 20 is a apted to press the plunger downwardly and to cause the downward or delivery stroke, the degree of pressure of which spring may be regulated by the adjusting screw 20. p

, The operation of the pump is as follows: When the plunger 6 is forced downwardly by the operating spring 21 water is forced through the valve 13 out through the delivery pipe 10 to the boiler, not shown. When the valve 13 opens the holder 14. splrings' downwardly as indicated by dotted use, but instantly returns to the normal osition when the plunger 6 begins its upwar stroke. The upward or suction stroke of the plun er 6 produces a partial vacuum in the cylin er 5 so that when the port i2 is uncovered water rushes in to fill the space. it is seen that the dome 3 performs the usual function or pro duces a uniform pressure, and that the pump will cease to operate when the pressure in said dome equals or exceeds the downward pressure on the plunger 6 caused by the spring 21. Thepin 2-5 will then reciprocate in slot 26 without moving the plunger until the pressure in the dome 3 is reduced by the escape of water through the delivery pipe 10. The pump will then resume its normal action. The function of the said screw 20 is to vary the tension of the spring 21 and to vary the pressure maintained in the dome 3, which varies in accordance with the tension of said spring, The pump it worked at its full capacity would furnish water in excess of that needed in the boiler, hence the necessity of the automatic regulating or throttling means as herein provided, 7

While I have shown what I deem to be the preferable form of my improved feed pump I do not wish to be limited thereto as there might be many changes made in the details of construction and arrangement of parts without departing from the spirit of my invention.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a feed pump for flash boilers, a water supply tank and a pump base integral therewith, a dome secured to said base, a? centrally and vertically disposed cylinder 3 secured in. said dome, a plunger adapted to reciprocate in said cylinder, means for aci tuating said plunger, an intake pipe in said cylinder connecting with the water contained in said tank, a delivery pipe in communication with said cylinder, a yieldable 1 check valve adapted to seat on a valve seat provided at the base of said cylinder, :1 resilient holder for said valve adapted to seat i on said base, a slot in said plunger, and a pin provided in said plunger actuating means] asap/ea with radial arms adapted to seat on the circular edge of a circular depression provided in said base, and downwardly extending projections in said cylinder extending through said holder and adapted to hold said valve in proper position.

3. In a feed pump for flash boilers, a base and a dome secured thereto, a cylinder and plunger secured in said dome, a spring and positive means for normally actuating said plunger, means for adjusting the tension of said spring, an intake port in said cylinder in communication with a water supply provided in connection with the pump, a circu- I lar depression in said base below said cylinder, a needle valve and seat arranged in said depression forming a portion of the delivery passage, a rubber washer on the stem of said needle valve for packing the same, and a rubber check valve provided with suitable holding means at the base of said cylinder. In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HERBERT L. THOMPSON. l/Vitnesses:

JOHN W. MCQUEEN, NnLs W. JOHNSON. 

